What is the fastest way to extract data from a huge text file?
Learn the fastest way to extract data from huge text files in MATLAB! Discover efficient techniques & code examples to handle large datasets. Read now!
Learn the fastest way to extract data from huge text files in MATLAB! Discover efficient techniques & code examples to handle large datasets. Read now!
>> tic,ION = cssm();toc Elapsed time is 0.074765 seconds. >> sum(not(isnan(ION(:)))) ans = 62196 >> whos ION Name Size Bytes Class Attributes ION 73x71x12 497568 double >> ION(lon2ix(0),lat2ix(85),ut2ix(20)) ans = 164 >> tic,ION(lon2ix(0),lat2ix(85),ut2ix(20));toc Elapsed time is 0.000067 seconds.
compared to
>> tic, [gim_tec] = sample_search_function( 20, 85, 0 ), toc gim_tec = 164 Elapsed time is 0.265756 seconds.
where
function ION = cssm() str = fileread( 'c:\m\cssm\CODG1520.txt' ); ca1 = regexp( str, '(?<=START OF TEC MAP).+?(?=END OF TEC MAP)', 'match' ); ION = nan( 73, 70, 11 ); lat2ix = @(lat) round((lat+87.5)/2.5)+1; lon2ix = @(lon) round((lon+180)/5.0)+1; %#ok ut2ix = @(ut) round(ut/2)+1; for jj = 1 : length( ca1 ) buf = regexp( ca1{jj}, '\n', 'split', 'once' ); buf = regexp( buf{2} , '\n', 'split', 'once' ); ut = textscan( buf{1}, '%*f%*f%*f%f%*[^\n]' ); ut = ut{1}; ca2 = regexp( buf{2}, 'LAT/LON1/LON2/DLON/H', 'split' ); pos = ca2{1}; for kk = 2 : length( ca2 ) lat = textscan( pos,'%f%*[^\n]' ); lat = lat{1}; num = sscanf( ca2{kk}(1:end-60), '%f' ); pos = strtrim( ca2{kk}(end-60+1:end) ); ION(:,lat2ix(lat),ut2ix(ut)) = num; end end end
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